M54455EVB Freescale, M54455EVB Datasheet - Page 14

• Manufacturer Part Number: M54455EVB
• Manufacturer: Freescale

Specifications of M54455EVB

• Architecture: 32-bit (not ARM)
• Lead Free Status / RoHS Status: Supplier Unconfirmed

4.5
A 16 Mbit SPI flash is connected to the MCF5445x via the DSPI interface. This same SPI flash can be
used to store reset configuration parameters and boot code when using the serial boot facility. Refer to
Section 4.3, “MCF5445x Boot
serial boot.
4.6
The M54455EVB features two flash devices connected to the FlexBus expansion bus. The smaller of the
two flashes is a 512KByte, 8-bit wide AT49BV040 (or compatible) device referred to as Flash0. This
device contains the U-Boot bootloader. The larger of the two flashes is a 16 MByte, 8-bit wide 28F128J3D
(or compatible) device referred to as Flash1. By default, this flash device is programmed with a Linux
image, but it can be reprogrammed and used as a boot device if desired.
The selection of a boot flash device is achieved with a CPLD mode switch setting, specifically
CPLD_MODE2 which is controllable by DIP switch SW1[3]. The device that is connected to the global
chip-select from the MCF5445x (FB_CS0) is the boot device. The other device is connected to FB_CS1.
Table 7
14
shows the boot device selection settings.
SPI Flash
Flash
SW1[3]
Figure 5. MCF5445x Input Clock Selection Cut-Trace
OFF
ON
Options” for more information on how to configure the M54455EVB for
Table 7. Flash Chip Select Configuration
M54455EVB User’s Manual, Rev. 4
cut trace
Flash1 is the boot device
Flash0 is the boot device
FLASH1_CS = FB_CS0
FLASH0_CS = FB_CS1
FLASH1_CS = FB_CS1
FLASH0_CS = FB_CS0
Meaning
solder
Boot custom image
Application
Boot U-Boot
Freescale Semiconductor